Table 2. Identified compounds in ethanol extracts of Glycyrrhiza uralensis using LC-QTOF-MS in negative ion mode

Rt1)	Identified compounds	Formula	Molecular ion [M-H]− (m/z)	MS2 fragment ions (m/z)	References
3.524	4-Hydroxyphenylpropionic acid	C9H10O3	165.0562	59, 65, 93, 119, 121, 165	(Liu et al., 2012)
4.190	Isoviolanthin	C26H30O14	577.1578	353, 383, 457, 473, 503, 577	(Zhang et al., 2018)
4.259	Isoliquiritigenin-4’-apiosyl (1→2) glucoside or its isomer	C26H30O13	549.1624	255, 429, 549	(Zhang et al., 2018)
4.321	Liquiritigenin-4’-apiosyl (1→2) glucoside or its isomer	C26H30O13	549.1623	119, 135, 255, 297, 417, 549	(Zhang et al., 2018)
4.397	Liquiritin (liquiritigenin-4’-O-glucoside)	C21H22O9	417.1203	119, 135, 255, 417	(Zhang et al., 2018)
5.065	Liquiritigenin-4’-apiosyl (1→2) glucoside or its isomer	C26H30O13	549.1622	135, 255, 417, 549	(Zhang et al., 2018)
5.171	Isoliquiritigenin-4’-apiosyl (1→2) glucoside or its isomer	C26H30O13	549.1624	135, 255, 429, 549	(Zhang et al., 2018)
5.268	Isoliquiritoside	C21H22O9	417.1205	119, 135, 148, 254, 255, 417	(Zhang et al., 2018)
5.384	Neoisoliquiritin	C21H22O9	417.1206	119, 135, 255	(Zhang et al., 2018)
5.757	Liquiritigenin	C15H12O4	255.0673	91, 119, 135	(Zhang et al., 2018)
7.223	Licorice saponin G2 or its isomer	C42H62O17	837.3928	837	(Ye et al., 2007; Zhang et al., 2018)
7.781	Licorice saponin G2 or its isomer	C42H62O17	837.3933	351, 837	(Ye et al., 2007; Zhang et al., 2018)

Retention time (min).